1 files changed, 9 insertions, 1 deletions
diff --git a/lib/slop/option.rb b/lib/slop/option.rb
index 3e414f9..b8533ae 100644
--- a/lib/slop/option.rb
+++ b/lib/slop/option.rb
@@ -3,6 +3,7 @@ module Slop
     DEFAULT_CONFIG = {
       help: true,
       tail: false,
+      underscore_flags: true,
     }
 
     # An Array of flags this option matches.
@@ -107,7 +108,14 @@ module Slop
 
     # Returns the last key as a symbol. Used in Options.to_hash.
     def key
-      (config[:key] || flags.last.sub(/\A--?/, '')).tr("-", "_").to_sym
+      key = config[:key] || flags.last.sub(/\A--?/, '')
+      key = key.tr '-', '_' if underscore_flags?
+      key.to_sym
+    end
+
+    # Returns true if this option should be displayed with dashes transformed into underscores.
+    def underscore_flags?
+      config[:underscore_flags]
     end
 
     # Returns true if this option should be displayed in help text.